description: Specifies that a date is relative to some event. The event happens [Duration] after [Event].
package_name: hl7.fhir.core
derivation: constraint
name: Relative Date Criteria
type: Extension
elements:
  extension:
    short: Event that the date is relative to
    type: Extension
    index: 0
    slicing:
      slices:
        event:
          match: {}
          schema:
            short: Event that the date is relative to
            type: Extension
            _required: true
            index: 0
            extensions: {}
            elements:
              extension: {index: 1}
              url:
                type: uri
                pattern: {type: Uri, value: event}
                index: 2
              value:
                choices: [valueReference, valueCodeableConcept]
                index: 4
              valueReference:
                type: Reference
                choiceOf: value
                refers: ['http://hl7.org/fhir/StructureDefinition/Resource']
                index: 5
              valueCodeableConcept: {type: CodeableConcept, choiceOf: value, index: 6}
            required: [valueReference, value, valueCodeableConcept]
        relationship:
          match: {}
          schema:
            type: Extension
            short: before-start | before | before-end | concurrent-with-start | concurrent | concurrent-with-end | after-start | after | after-end
            _required: true
            index: 7
            extensions: {}
            elements:
              extension: {index: 8}
              url:
                type: uri
                pattern: {type: Uri, value: relationship}
                index: 9
              valueCode:
                type: code
                binding: {strength: required, valueSet: 'http://hl7.org/fhir/ValueSet/action-relationship-type'}
                index: 10
        offset:
          match: {}
          schema:
            type: Extension
            short: Duration after the event
            _required: true
            index: 11
            extensions: {}
            elements:
              extension: {index: 12}
              url:
                type: uri
                pattern: {type: Uri, value: offset}
                index: 13
              valueDuration: {type: Duration, index: 14}
  url:
    type: uri
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/relative-date'}
    index: 15
  value:
    choices: []
    index: 17
package_version: 3.5.0
extensions:
  event:
    url: null
    short: Event that the date is relative to
    type: Extension
    _required: true
    index: 0
    extensions: {}
    elements:
      extension: {index: 1}
      url:
        type: uri
        pattern: {type: Uri, value: event}
        index: 2
      value:
        choices: [valueReference, valueCodeableConcept]
        index: 4
      valueReference:
        type: Reference
        choiceOf: value
        refers: ['http://hl7.org/fhir/StructureDefinition/Resource']
        index: 5
      valueCodeableConcept: {type: CodeableConcept, choiceOf: value, index: 6}
    required: [valueReference, value, valueCodeableConcept]
  relationship:
    url: null
    type: Extension
    short: before-start | before | before-end | concurrent-with-start | concurrent | concurrent-with-end | after-start | after | after-end
    _required: true
    index: 7
    extensions: {}
    elements:
      extension: {index: 8}
      url:
        type: uri
        pattern: {type: Uri, value: relationship}
        index: 9
      valueCode:
        type: code
        binding: {strength: required, valueSet: 'http://hl7.org/fhir/ValueSet/action-relationship-type'}
        index: 10
  offset:
    url: null
    type: Extension
    short: Duration after the event
    _required: true
    index: 11
    extensions: {}
    elements:
      extension: {index: 12}
      url:
        type: uri
        pattern: {type: Uri, value: offset}
        index: 13
      valueDuration: {type: Duration, index: 14}
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/relative-date
base: http://hl7.org/fhir/StructureDefinition/Extension
version: null
required: [extension]